To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I've given it five stars as that's what I am expecting it to be. So far I have not taken it from it's wrapper as I cannot put it on the bed and must wait till my corer visits and puts it on the bed for me.